Miner s safety-lam p



'No.f'?4"8,\ s2. PAVTENTED JAN}. 5, 1904.

" M. G. MOORE & R". v. SAGE.

MINERS SAPETY LAMP. APPLICATION FILED NOV. 17, 1902.

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U ITED STATES Patented January 5, 1904.

PATENT OFFICE.

' MARSHALL G. MOORE, OF 'JOHNSTOWN, AND RALPH V. SAGE, OF BOROUGH OF WESTMONT, PENNSYLVANIA.

MlNERS SAFETY-LAM P.

SPECIFICATION forming part of Letters Patent N 0. 748,632, dated January 5, 1904.

Application filed November 17, 1902. Serial No. 131,610. (No model.)

" in Miners Safety-Lamps; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The construction of the miners safetylamps in ordinary use is such that they can be carelessly or negligently put together, the lamp-glass set and screwed into place without having the gauze or gauzes in position, which would of course result in disastrous explosions, and thus defeat thevery object for which the lamps are constructednamely, safety when used in gaseous locations.

Our invention has for its object the production of an improved construction of safetylamps whereby it is insured that the various portions, including the lamp glass, gauze hoods, and the adjustable supporting-ring for same, cannot be assembled independently of each other, and our arrangement is such that the lamp-glass cannot be put and held in place unless the gauze hoods are in proper position for service.

Referring now to the annexed sheet of drawings,which form part of this specification, and in which like figures and letters refer to like parts, Figure 1 is acentral vertical section of our complete improved lamp. Fig. 2is an enlarged vertical sectional view of the arrangement shown inFig. 1 for holding the top of the lamp-glass and the gauzehoods in position.

Referring now to the various characters of reference on Figs. 1 and 2 of the drawings, 1 is the lower portion of the lamp-body.

2 is the lower part of the lamp-frame, provided with internal screw-threads, as shown.

3 is a metallic externally-threaded adjustable supporting-ring fitted within the internal threads of the lamp-frame 2 and adapted for securing the lamp-glass in position.

4 is the lam p-glass, of the usual cylindrical form.

' hoods.

5 is the inner gauze hood.

6 is the outer gauze hood.

7 is the metallic bonnet or jacket, and 8 is the annular base of said bonnet or jacket.

26 represents one of the rods connecting the frame 2 with the bonnet-ring.

9 is a metallic Z-shaped retaining-ring fastened to the lower portion of the inner gauze hood 5. 6o

10 is adownwardly-projecting flange of the retaining-ring 9, which extends over the outside of the lamp-glass 4, as shown.

11 is a metallic washer secured to the Z- shaped retaining-ring 9.

12 is an Lshaped flange forming part of and extending downwardly from the annular base 8 and serving as an abutment for the retaining-ring 13 of the gauze hood.

13 is a metallic L-shaped retaining-ring 7o fastened to the outer gauze hood 6 and eX- tending over the L-shaped flange or abutment 12 for the purpose of holding the gauze hoods.

14 is a metallic washer secured to the L- shaped retaining-ring l3, and 15 is an asbestos packing-ring or gasket interposed between the Z-shaped retaining-ring9 and the lamp-glass 4.

As indicated in Figs. 1 and 2, 16 represents rivets for securing the metallic washers to the retaining-rings attached to the lower portions of the gauze hoods.

In assembling the various portions of the construction in order to prepare the lamp for use after cleaning, the main frame, including the jacket, is ordinarily held upside down, the gauze hoods 6 and 5 are inserted in position, and the gasket 15 put in place. The lampglass 4 is then set upon the gasket and is retained in position by the projecting flange of I the encircling metallic retaining-ring which forms the lower portion of one of the gauze The adjustable supporting-ring 3, with its appurtenances, is then screwed into 5 place, thus firmly securing the lamp-glass and the hoods in position, after which the frame is held in an upright position, the lampbody 1 screwed in and locked in the usual manner.

An important feature of our invention will be noted on reference to the drawings, from which it may be seen that the distance a from the top of the lamp-glass to the lower portion of the flange or the abutment of the annular base of the bonnet is considerably greater than the distance I) or extent of the thread of IO hoods.

If by negligence the gauze hoods are not put into position, it will be found impossible with our construction to secure the lampglass in place, as in this case the attempt to screw up the adjustable supporting-ring 3 will cause it to entirely pass through the threaded portion of the lamp-frame 2 without having brought the upper portion of the lamp-glass to a bearing, for the reason that the parts will not be screwed against the abutment, as may be readily understood. In addition to this, the downwardly-projecting flanges of the retaining-rings which are secured to the bottoms of the gauze hoods are 'E5 neicessary to hold the lamp-glass at its top,

and therefore said glass could not be put into place unless the gauze hoods are first in position. It will thus be seen that our construction is such that the vital portions of the lamp which insure safety in use must be assembled correctly, and the lamp cannot be put together otherwise.

Although we have described and illustrated our invention as applied to a lamp having 7 gg two gauze hoods, it may also be used in connection with a lamp having but one gauze, as may be readily understood, and although we have shown our invention in considerable detail we do not limit ourselves to the exact and specific particulars of the arrangements herein described and illustrated, but may use such variations and modifications or equivalents thereof as are embraced within the scope of our invention and as pointed out in the claim.

Having thus described our invention, what we claim, and desire to secure by United States Letters Patent, is

In a miners safety-lamp, a hollow cylindrical lamp-glass, a supporting-ring for same adj ustably screwed in the base of said lamp, a flanged annular abutment secured to the frame of the lamp above the top of the lampglass, an outer gauze hood provided with a retainingring of L-section, the projecting flange of which is adapted to rest against the lower flange of said abutment, a washer secured to the retaining-ring aforesaid; an inner gauze hood provided with a retainingring of Z-section and a washer secured thereto adapted to fit against the washer of the outer hood, the flange of said Z-section being adapted to [it against the exterior cyli-n Witnesses:

STONE EDELEN, HERBERT LUEBBERT. 

